CN107796851A - Blast furnace gas boiler as-fired coal gas calorific value and boiler thermal output on-line monitoring method - Google Patents

Blast furnace gas boiler as-fired coal gas calorific value and boiler thermal output on-line monitoring method Download PDF

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CN107796851A
CN107796851A CN201711170897.2A CN201711170897A CN107796851A CN 107796851 A CN107796851 A CN 107796851A CN 201711170897 A CN201711170897 A CN 201711170897A CN 107796851 A CN107796851 A CN 107796851A
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gas
msub
boiler
blast furnace
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CN107796851B (en
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叶亚兰
王宏明
安翔
马琳
王宜翠
王玉洁
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Jiangsu Maritime Institute
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
    • G01N25/28—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly
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    • G01—MEASURING; TESTING
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    • G01—MEASURING; TESTING
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Abstract

A kind of blast furnace gas boiler as-fired coal gas calorific value and boiler thermal output on-line monitoring method, comprise the following steps：In real time collection unit on-line operation data, including flue gas oxygen content, CO content in smoke, exhaust gas temperature, enter stove blast furnace gas flow, boiler capacity, environment temperature and solve boiler effectively using heat input data；The initial data of acquisition is pre-processed, obtains valid data；According to the valid data of acquisition, the as-fired coal gas calorific value and boiler thermal output of blast furnace gas boiler are obtained.The present invention can on-line identification go out the Lower heat value of blast furnace gas, and for the on-line monitoring of boiler thermal output, reliable basis can be provided for the performance evaluation of boiler and firing optimization, there is important Practical significance；Blast furnace gas calorific value and boiler thermal output are calculated online by boiler operating parameter completely, without offline gathered data and any artificial input parameter, are fully relied on unit online acquisition data and be can be achieved, have good exploitativeness.

Description

Blast furnace gas boiler as-fired coal gas calorific value and boiler thermal output on-line monitoring method
Technical field
The invention belongs to the field of boilers of Thermal Power Engineering, and in particular to blast furnace gas boiler as-fired coal gas calorific value and boiler hot Efficiency on-line monitoring method.
Background technology
Iron and steel enterprise generates substantial amounts of blast furnace gas in Iron-smelting, as the by-product resource of smelting process, blast furnace The effective recycling of coal gas is one of emphasis of the energy-saving work of iron and steel enterprise.In recent years, with low-heat value gas combustion The development and progress of technology, blast furnace gas boiler is widely applied in power plant for self-supply of steel plant, and has been increasingly becoming steel Enterprise utilizes the major way of blast furnace gas.
Iron and steel enterprise produces substantial amounts of blast furnace gas in Iron-smelting, as the by-product resource of smelting process, blast furnace coal The effective recycling of gas is one of emphasis of the energy-saving work of iron and steel enterprise.
In recent years, as the development and progress of gas-fired technology, some steel plant absorb steel mill using gas boiler Blast furnace gas more than needed, and achieve preferable effect.
Fuel value is the important evidence of gas boiler firing optimization, while is also the basic input ginseng of boiler thermal output Number, change and the fluctuation of fuel value can produce a very large impact to the safety of boiler and economical operation.However, by condition institute Limit, current most of power plants for self-supply of iron and steel enterprise gas boiler all do not configure blast furnace gas calorific value on-line measurement device, power plant's base It is still to enter stove fuel value, many mini-medium mills as current boiler to be manually entered regular assay value in sheet The condition of power plant for self-supply's even coal gas regular sample examination analysis do not possess, its conventional practice is directly to take artificial setting Value or last hot test value.And in fact, being influenceed by factors such as upstream smelting procedures, the composition and heat of blast furnace gas Value is difficult to keep stable, and often in fluctuation status, the regular laboratory values being manually entered are likely to greatly deviate from currently true Value, takes artificial setting value or takes the mode of last hot test value even more so.Obviously, blast furnace gas calorific value is uncertain Property can directly influence the solution of boiler thermal output, and then influence the performance analysis and optimization operation of boiler.
Based on this background, if a blast furnace gas boiler can be built under the conditions of the existing limitation of power plant for self-supply of steel mill The on-line monitoring method of as-fired coal gas calorific value and boiler thermal output, it is online to obtain calorific value of gas data, and use it for online point Boiler thermal output is analysed, to provide foundation for the operation control of boiler and firing optimization, good economic benefit will be produced, is had There are important practical value and engineering significance.
The content of the invention
The present invention's is directed to deficiency of the prior art, there is provided a kind of blast furnace gas boiler as-fired coal gas calorific value and boiler hot Efficiency on-line monitoring method.
To achieve the above object, the present invention uses following technical scheme：
A kind of blast furnace gas boiler as-fired coal gas calorific value and boiler thermal output on-line monitoring method, it is characterised in that including Following steps：
Step 1：The on-line operation data of collection unit in real time, including：Flue gas oxygen content, CO content in smoke, smoke evacuation temperature Spend, enter the input data that stove blast furnace gas flow, boiler capacity, environment temperature and boiler effectively utilize heat；
Step 2：The input data of acquisition is pre-processed, obtains being used to solve blast furnace gas calorific value and boiler thermal output Valid data；
Step 3：According to the valid data of acquisition, the as-fired coal gas calorific value and boiler thermal output of blast furnace gas boiler are obtained, Specifically include：
3.1 assume an initial blast furnace gas butt Lower heat value；
3.2 carry out boiler combustion calculating according to the blast furnace gas Lower heat value of hypothesis；
3.3 solve boiler input heat；
3.4 solve blast furnace gas boilers various heat losses, including heat loss due to exhaust gas, heat loss due to unburned gas and Radiation loss；
3.5 solve boiler thermal output according to boiler various heat losses；
3.6 effectively utilize heat according to unit operation parametric solution boiler；
3.7 calculate blast furnace gas butt Lower heat value；
3.8 by blast furnace gas butt Lower heat value calculated value with assume blast furnace gas butt Lower heat value compared with, By the absolute value of the two difference compared with the small quantity set, the return to step 3.1 if being unsatisfactory for requiring, if meeting to require Then enter step 3.9；
3.9：Export blast furnace gas butt Lower heat value calculated value QD, netIt is defeated as current blast furnace gas butt Lower heat value It is current boiler thermal output to go out boiler thermal output η；
Step 4：The result of calculation that issuing steps 3.9 export so that terminal user can be with displaying live view.
To optimize above-mentioned technical proposal, the concrete measure taken also includes：
The pretreatment includes bad point processing and data smoothing processing.
Step 3.2 specifically includes：
3.2.1 the theoretical dry air amount needed for the burning of unit of account volume dry gas and the burning of unit volume dry gas produce Theoretical dry flue gas amount：
1) the theoretical dry air amount needed for the gas-fired of unit of account volume：
Wherein,For the theoretical dry air amount needed for unit volume gas-fired, m3/m3(dry gas)；For hypothesis Blast furnace gas butt Lower heat value, kJ/m3(dry gas)；
2) theoretical dry flue gas amount caused by the gas-fired of unit of account volume：
Wherein,For theoretical dry flue gas amount, m caused by unit volume gas-fired3/m3(dry gas)；For hypothesis Blast furnace gas butt Lower heat value, kJ/m3(dry gas)；
3.2.2 calculate the fuel characteristic factor：
Wherein, χ is the fuel characteristic factor；For theoretical dry flue gas amount, m caused by unit volume gas-fired3/m3It is (dry Coal gas)；For the theoretical dry air amount needed for unit volume gas-fired, m3/m3(dry gas)；
3.2.3 excess air coefficient is calculated：
Wherein, α is excess air coefficient；χ is the fuel characteristic factor；φ′(O2), φ ' (CO) be respectively flue gas oxygen content And CO content in smoke；
3.2.4 actual dry flue gas amount caused by the gas-fired of unit of account volume：
Wherein, VgyFor actual dry flue gas amount, m caused by unit volume gas-fired3/m3(dry gas)；For unit body Theoretical dry flue gas amount caused by product gas-fired, m3/m3(dry gas)；For the dry sky of theory needed for unit volume gas-fired Tolerance, m3/m3(dry gas)；α is excess air coefficient；
3.2.5 steam vapour amount contained in flue gas caused by the gas-fired of unit of account volume：
Wherein,For steam vapour amount contained in flue gas caused by unit volume gas-fired, m3/m3(dry gas)；α For excess air coefficient at smoke evacuation；For the theoretical dry air amount needed for unit volume gas-fired, m3/m3(dry gas)；dkFor The absolute humidity of air, kg/kg；dgFor coal gas water capacity, kg/m3(dry gas).
Step 3.3 specifically includes：
Solve boiler input heat Qr：
Wherein, QrHeat, kJ/m are inputted for boiler3；For the blast furnace gas butt Lower heat value of hypothesis, kJ/m3；dgFor Coal gas water capacity, kg/m3(dry gas).
Step 3.4 specifically includes：
3.4.1 heat loss due to exhaust gas is calculated：
1) dry flue gas is calculated in t0To θpyAverage specific heat capacity at constant pressure c between temperatureP, gy：
cP, gy=2.458 × 10-4θpy+1.381
Wherein, cP, gyIt is dry flue gas in t0To θpyAverage specific heat capacity at constant pressure between temperature, kJ/ (m3·K)；θpyFor smoke evacuation temperature Degree, DEG C；
2) vapor is calculated in t0To θpyAverage specific heat capacity at constant pressure between temperature
Wherein,It is vapor in t0To θpyAverage specific heat capacity at constant pressure between temperature, kJ/ (m3·K)；θpyFor smoke evacuation temperature Degree, DEG C；
3) heat loss due to exhaust gas is calculated：
Wherein, g2For heat loss due to exhaust gas, %；θpyFor exhaust gas temperature, DEG C；t0On the basis of temperature；cP, gyIt is dry flue gas in t0Extremely θpyAverage specific heat capacity at constant pressure between temperature, kJ/ (m3·K)；It is vapor in t0To θpyAverage specific level pressure heat between temperature Hold, kJ/ (m3·K)；VgyFor actual dry flue gas amount, m caused by unit volume gas-fired3/m3(dry gas)；For unit Contained steam vapour amount, m in flue gas caused by volume gas-fired3/m3(dry gas)；QrHeat, kJ/m are inputted for boiler3；
3.4.2 heat loss due to unburned gas is calculated：
Wherein, q3For heat loss due to unburned gas, %；VgyFor actual dry flue gas caused by unit volume gas-fired Amount, m3/m3(dry gas)；φ ' (CO) is CO content in smoke, %；QrHeat, kJ/m are inputted for boiler3；
3.4.3 radiation loss is calculated：
Wherein, q5For radiation loss, %；DeFor the evaporation capacity under boiler rated load, t/h；D is boiler actual evaporation, t/h。
Step 3.5 specifically includes：
Boiler thermal output η is solved according to boiler various heat losses：
η=100- (q2+q3+q5)
Wherein, η is boiler thermal output, %；q2For heat loss due to exhaust gas, %；q3For heat loss due to unburned gas, %；q5 For radiation loss, %.
Step 3.6 specifically includes：
Hot Q is effectively utilized according to unit operation parametric solution boiler1：
1) for the unit containing reheat system：
Q1=Dgr(h″gr-hgs)+Dzr(h″zr-h′zr)+Dpw(hpw-hgs)
Wherein, Q1Heat, kJ/h are effectively utilized for boiler；DgrFor superheat steam flow, kg/h；DzrFor reheated steam flow, kg/h；DpwFor blowdown water-carrying capacity, kg/h；h″grFor superheated steam enthalpy, kJ/kg；h″zrFor reheat heat steam enthalpy, kJ/kg；h″zrFor Cold reheated steam enthalpy, kJ/kg；hgsFor the enthalpy that feeds water, kJ/kg；hpwFor sewer enthalpy, kJ/kg；
2) for the unit without reheat system：
Q1=Dgr(h″gr-hgs)+Dpw(hpw-hgs)
Wherein, Q1Heat, kJ/h are effectively utilized for boiler；DgrFor superheat steam flow, kg/h；DpwFor blowdown water-carrying capacity, kg/ h；h″grFor superheated steam enthalpy, kJ/kg；hgsFor the enthalpy that feeds water, kJ/kg；hpwFor sewer enthalpy, kJ/kg.
Step 3.7 specifically includes：
Calculate blast furnace gas butt Lower heat value：
Wherein, QD, netFor blast furnace gas butt Lower heat value calculated value, kJ/m3；Q1Heat, kJ/h are effectively utilized for boiler；Bg For the blast furnace coal tolerance of on-line measurement, m3/h；η is boiler thermal output, %；dgFor coal gas water capacity, kg/m3。
Step 3.8 specifically includes：
By blast furnace gas butt Lower heat value calculated value QD, netWith the blast furnace gas butt Lower heat value of hypothesisCarry out Compare, by QD, netWithDifference absolute valueCompared with the small quantity ε of setting：
IfMore than the small quantity ε of setting, then willIt is assigned to the initial blast furnace gas of hypothesis Butt Lower heat valueReturn to step 3.1, step 3.1~3.8 are performed again, solve blast furnace gas butt low level heat again It is worth calculated value QD, net, untilLess than or equal to the small quantity ε of setting；
IfLess than or equal to the small quantity ε of setting, then into step 3.9.
The beneficial effects of the invention are as follows：
1) present invention be used for blast furnace gas boiler as-fired coal gas calorific value hard measurement, can on-line identification go out blast furnace gas Lower heat value, and it is used for the on-line monitoring of boiler thermal output, reliable basis can be provided for the performance evaluation of boiler and firing optimization, With important Practical significance；
2) blast furnace gas calorific value and boiler thermal output are calculated online by boiler operating parameter completely, without adopting offline Collect data, without any artificial input parameter, fully rely on unit online acquisition data and can be achieved, there is good implement Property；
3) any thermal technology's measuring point need not be increased, can be achieved using existing thermal technology's condition, investment relatively saves.
Brief description of the drawings
Fig. 1 is as-fired coal gas calorific value of the present invention and boiler thermal output on-line monitoring schematic flow sheet.
Fig. 2 is that present invention burning calculates schematic flow sheet.
Embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.
Blast furnace gas boiler as-fired coal gas calorific value as shown in Figure 1 and Figure 2 and boiler thermal output on-line monitoring method, are realized Scheme is as follows：
1st, the on-line operation data of unit are gathered in real time by plant level supervisory information system, including：Flue gas oxygen content, flue gas Middle CO contents, exhaust gas temperature, enter stove blast furnace gas flow, boiler capacity, environment temperature, and boiler effectively utilizes the defeated of heat Enter parameter.
2nd, the input data obtained to step 1 pre-processes, including bad point processing and data smoothing processing, is used for Solve the valid data of blast furnace gas calorific value and boiler thermal output.
3rd, the valid data obtained according to step 2, the as-fired coal gas calorific value and boiler thermal output of blast furnace gas boiler are obtained, Specifically include following steps：
3.1 assume an initial blast furnace gas butt Lower heat value
3.2 carry out boiler combustion calculating according to blast furnace gas butt Lower heat value, specifically include：
3.2.1 the theoretical dry air amount needed for the burning of unit of account volume dry gasBurn and produce with unit volume dry gas Raw theoretical dry flue gas amount
1) the theoretical dry air amount needed for the gas-fired of unit of account volume：
Wherein,For the theoretical dry air amount needed for unit volume gas-fired, m3/m3(dry gas)；To assume Blast furnace gas butt Lower heat value, kJ/m3(dry gas)；
2) theoretical dry flue gas amount caused by the gas-fired of unit of account volume：
Wherein,For theoretical dry flue gas amount, m caused by unit volume gas-fired3/m3(dry gas)；To assume Blast furnace gas butt Lower heat value, kJ/m3(dry gas).
3.2.2 fuel characteristic factor χ is calculated：
Wherein, χ is fuel characteristic factor χ；For theoretical dry flue gas amount, m caused by unit volume gas-fired3/m3It is (dry Coal gas)；For the theoretical dry air amount needed for unit volume gas-fired, m3/m3(dry gas).
3.2.3 excess air coefficient is calculated：
Wherein, α is excess air coefficient；χ is the fuel characteristic factor；φ′(O2), φ ' (CO) be respectively flue gas oxygen content And CO content in smoke.
3.2.4 actual dry flue gas amount caused by the gas-fired of unit of account volume：
Wherein, VgyFor actual dry flue gas amount, m caused by unit volume gas-fired3/m3(dry gas)；For unit body Theoretical dry flue gas amount caused by product gas-fired, m3/m3(dry gas)；For the dry sky of theory needed for unit volume gas-fired Tolerance, m3/m3(dry gas)；α is excess air coefficient.
3.2.5 steam vapour amount contained in flue gas caused by the gas-fired of unit of account volume：
Wherein,For steam vapour amount contained in flue gas caused by unit volume gas-fired, m3/m3(dry gas)；α For excess air coefficient at smoke evacuation；For the theoretical dry air amount needed for unit volume gas-fired, m3/m3(dry gas)；dkFor The absolute humidity of air, kg/kg；dgFor coal gas water capacity, kg/m3(dry gas).
3.3 solve boiler input heat Qr：
Wherein, QrHeat, kJ/m are inputted for boiler3；For the blast furnace gas butt Lower heat value of hypothesis, kJ/m3；dgFor Coal gas water capacity, kg/m3(dry gas).
3.4 solve the various heat losses of blast furnace gas boiler, including heat loss due to exhaust gas q2, heat loss due to unburned gas q3, radiation loss q5, it is specific as follows：
3.4.1 calculate heat loss due to exhaust gas q2：
1) dry flue gas is calculated in t0To θpyAverage specific heat capacity at constant pressure c between temperatureP, gy：
cP, gy=2.458 × 10-4θPy+1.381
Wherein, cP, gyIt is dry flue gas in t0To θpyAverage specific heat capacity at constant pressure between temperature, kJ/ (m3·K)；θpyFor smoke evacuation temperature Degree, DEG C；
2) vapor is calculated in t0To θpyAverage specific heat capacity at constant pressure between temperature
Wherein,It is vapor in t0To θpyAverage specific heat capacity at constant pressure between temperature, kJ/ (m3·K)；θpyFor smoke evacuation temperature Degree, DEG C；
3) heat loss due to exhaust gas is calculated：
Wherein, q2For heat loss due to exhaust gas, %；θpyFor exhaust gas temperature, DEG C；t0On the basis of temperature；cP, gyIt is dry flue gas in t0Extremely θpyAverage specific heat capacity at constant pressure between temperature, kJ/ (m3·K)；It is vapor in t0To θpyAverage specific level pressure heat between temperature Hold, kJ/ (m3·K)；VgyFor actual dry flue gas amount, m caused by unit volume gas-fired3/m3(dry gas)；For unit Contained steam vapour amount, m in flue gas caused by volume gas-fired3/m3(dry gas)；Qr is that boiler inputs heat, kJ/m3；
3.4.2 heat loss due to unburned gas is calculated：
Wherein, q3For heat loss due to unburned gas, %；VgyFor actual dry flue gas caused by unit volume gas-fired Amount, m3/m3(dry gas)；φ ' (CO) is CO content in smoke, %；QrHeat, kJ/m are inputted for boiler3；
3.4.3 radiation loss is calculated：
Wherein, q5For radiation loss, %；DeFor the evaporation capacity under boiler rated load, t/h；D is boiler actual evaporation, t/h。
3.5 solve boiler thermal output η according to boiler various heat losses：
η=100- (q2+q3+q5)
Wherein, η is boiler thermal output, %；q2For heat loss due to exhaust gas, %；q3For heat loss due to unburned gas, %；q5 For radiation loss, %.
3.6 effectively utilize hot Q according to unit operation parametric solution boiler1：
1) for the unit containing reheat system：
Q1=Dgr(h″gr-hgs)+Dzr(h″zr-h′zr)+Dpw(hpw-hgs)
Wherein, Q1Heat, kJ/h are effectively utilized for boiler；DgrFor superheat steam flow, kg/h；DzrFor reheated steam flow, kg/h；DpwFor blowdown water-carrying capacity, kg/h；h″grFor superheated steam enthalpy, kJ/kg；h″zrFor reheat heat steam enthalpy, kJ/kg；h′zrFor Cold reheated steam enthalpy, kJ/kg；hgsFor the enthalpy that feeds water, kJ/kg；hpwFor sewer enthalpy, kJ/kg；
2) for the unit without reheat system：
Q1=Dgr(h″gr-hgs)+Dpw(hpw-hgs)
Wherein, Q1Heat, kJ/h are effectively utilized for boiler；DgrFor superheat steam flow, kg/h；DpwFor blowdown water-carrying capacity, kg/ h；h″grFor superheated steam enthalpy, kJ/kg；hgsFor the enthalpy that feeds water, kJ/kg；hpwFor sewer enthalpy, kJ/kg.
3.7 calculate blast furnace gas butt Lower heat value：
Wherein, QD, netFor blast furnace gas butt Lower heat value calculated value, kJ/m3；Q1Heat, kJ/h are effectively utilized for boiler；Bg For the blast furnace coal tolerance of on-line measurement, m3/h；η is boiler thermal output, %；dgFor coal gas water capacity, kg/m3。
3.8 by blast furnace gas butt Lower heat value calculated value QD, netWith the blast furnace gas butt Lower heat value of hypothesisEnter Row compares, by QD, netWithDifference absolute valueCompared with the small quantity ε of setting：
IfMore than the small quantity ε of setting, then willIt is assigned to the initial blast furnace gas of hypothesis Butt Lower heat valueReturn to step 3.1, step 3.1~3.8 are performed again, solve blast furnace gas butt low level heat again It is worth calculated value QD, net, untilLess than or equal to the small quantity ε of setting；
IfLess than or equal to the small quantity ε of setting, then into step 3.9；
3.9 output blast furnace gas butt Lower heat value QD, netAs current blast furnace gas butt Lower heat value, boiler is exported Thermal efficiency η is current boiler thermal output.
4th, the result of calculation that issuing steps 3.9 export so that terminal user can be with displaying live view.
It follows that the present invention be used for blast furnace gas boiler as-fired coal gas calorific value hard measurement, can on-line identification go out height The Lower heat value of producer gas, and for the on-line monitoring of boiler thermal output, can be provided for the performance evaluation of boiler and firing optimization Reliable basis, there is important Practical significance；Blast furnace gas calorific value and boiler thermal output are completely online by boiler operating parameter It is calculated, without offline gathered data, without any artificial input parameter, fully relying on unit online acquisition data can be real It is existing, there is good exploitativeness；In addition, any thermal technology's measuring point need not be increased, can be achieved using existing thermal technology's condition, investment Compared with province.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment, All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, the protection of the present invention should be regarded as Scope.

Claims (9)

1. a kind of blast furnace gas boiler as-fired coal gas calorific value and boiler thermal output on-line monitoring method, it is characterised in that including with Lower step：
Step 1：The on-line operation data of collection unit in real time, including：Flue gas oxygen content, CO content in smoke, exhaust gas temperature, enter Stove blast furnace gas flow, boiler capacity, environment temperature and boiler effectively utilize the input data of heat；
Step 2：The input data of acquisition is pre-processed, obtained for solving having for blast furnace gas calorific value and boiler thermal output Imitate data；
Step 3：According to the valid data of acquisition, the as-fired coal gas calorific value and boiler thermal output of blast furnace gas boiler are obtained, specifically Including：
3.1 assume an initial blast furnace gas butt Lower heat value；
3.2 carry out boiler combustion calculating according to the blast furnace gas Lower heat value of hypothesis；
3.3 solve boiler input heat；
3.4 solve the various heat losses of blast furnace gas boiler, including heat loss due to exhaust gas, heat loss due to unburned gas and radiating Loss；
3.5 solve boiler thermal output according to boiler various heat losses；
3.6 effectively utilize heat according to unit operation parametric solution boiler；
3.7 calculate blast furnace gas butt Lower heat value；
3.8 by blast furnace gas butt Lower heat value calculated value with assume blast furnace gas butt Lower heat value compared with, by two The absolute value of person's difference the return to step 3.1 if being unsatisfactory for requiring, enters compared with the small quantity set if meeting to require Enter step 3.9：
3.9：Export blast furnace gas butt Lower heat value calculated value QD, netAs current blast furnace gas butt Lower heat value, pot is exported Furnace thermal efficiency η is current boiler thermal output；
Step 4：The result of calculation that issuing steps 3.9 export so that terminal user can be with displaying live view.
2. a kind of blast furnace gas boiler as-fired coal gas calorific value as claimed in claim 1 and boiler thermal output on-line monitoring method, It is characterized in that：The pretreatment includes bad point processing and data smoothing processing.
3. a kind of blast furnace gas boiler as-fired coal gas calorific value as claimed in claim 1 and boiler thermal output on-line monitoring method, It is characterized in that：Step 3.2 specifically includes：
3.2.1 managed caused by the theoretical dry air amount needed for the burning of unit of account volume dry gas and the burning of unit volume dry gas By dry flue gas amount：
1) the theoretical dry air amount needed for the gas-fired of unit of account volume：
<mrow> <msubsup> <mi>V</mi> <mrow> <mi>g</mi> <mi>k</mi> </mrow> <mn>0</mn> </msubsup> <mo>=</mo> <mn>1.952</mn> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>4</mn> </mrow> </msup> <msubsup> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>n</mi> <mi>e</mi> <mi>t</mi> </mrow> <mn>0</mn> </msubsup> </mrow>
Wherein,For the theoretical dry air amount needed for unit volume gas-fired, m3/m3(dry gas)；For the height of hypothesis Producer gas butt Lower heat value, kJ/m3(dry gas)；
2) theoretical dry flue gas amount caused by the gas-fired of unit of account volume：
<mrow> <msubsup> <mi>V</mi> <mrow> <mi>g</mi> <mi>y</mi> </mrow> <mn>0</mn> </msubsup> <mo>=</mo> <mn>1.467</mn> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>4</mn> </mrow> </msup> <msubsup> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>n</mi> <mi>e</mi> <mi>t</mi> </mrow> <mn>0</mn> </msubsup> <mo>+</mo> <mn>1</mn> </mrow>
Wherein,For theoretical dry flue gas amount, m caused by unit volume gas-fired3/m3(dry gas)；For the blast furnace of hypothesis Coal gas butt Lower heat value, kJ/m3(dry gas)；
3.2.2 calculate the fuel characteristic factor：
<mrow> <mi>&amp;chi;</mi> <mo>=</mo> <mfrac> <msubsup> <mi>V</mi> <mrow> <mi>g</mi> <mi>y</mi> </mrow> <mn>0</mn> </msubsup> <msubsup> <mi>V</mi> <mrow> <mi>g</mi> <mi>k</mi> </mrow> <mn>0</mn> </msubsup> </mfrac> <mo>-</mo> <mn>1</mn> </mrow>
Wherein, χ is the fuel characteristic factor；For theoretical dry flue gas amount, m caused by unit volume gas-fired3/m3(dry coal Gas)；For the theoretical dry air amount needed for unit volume gas-fired, m3/m3(dry gas)；
3.2.3 excess air coefficient is calculated：
<mrow> <mi>&amp;alpha;</mi> <mo>=</mo> <mfrac> <mrow> <mn>21</mn> <mo>+</mo> <mi>&amp;chi;</mi> <mo>&amp;lsqb;</mo> <msup> <mi>&amp;phi;</mi> <mo>&amp;prime;</mo> </msup> <mrow> <mo>(</mo> <msub> <mi>O</mi> <mn>2</mn> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mn>0.5</mn> <msup> <mi>&amp;phi;</mi> <mo>&amp;prime;</mo> </msup> <mrow> <mo>(</mo> <mi>C</mi> <mi>O</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> <mrow> <mn>21</mn> <mo>-</mo> <mo>&amp;lsqb;</mo> <msup> <mi>&amp;phi;</mi> <mo>&amp;prime;</mo> </msup> <mrow> <mo>(</mo> <msub> <mi>O</mi> <mn>2</mn> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mn>0.5</mn> <msup> <mi>&amp;phi;</mi> <mo>&amp;prime;</mo> </msup> <mrow> <mo>(</mo> <mi>C</mi> <mi>O</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> </mfrac> </mrow>
Wherein, α is excess air coefficient；χ is the fuel characteristic factor；φ′(O2), φ ' (CO) be respectively flue gas oxygen content and flue gas Middle CO contents；
3.2.4 actual dry flue gas amount caused by the gas-fired of unit of account volume：
<mrow> <msub> <mi>V</mi> <mrow> <mi>g</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msubsup> <mi>V</mi> <mrow> <mi>g</mi> <mi>y</mi> </mrow> <mn>0</mn> </msubsup> <mo>+</mo> <mrow> <mo>(</mo> <mi>&amp;alpha;</mi> <mo>-</mo> <mn>1</mn> <mo>)</mo> </mrow> <msubsup> <mi>V</mi> <mrow> <mi>g</mi> <mi>k</mi> </mrow> <mn>0</mn> </msubsup> </mrow>
Wherein, VgyFor actual dry flue gas amount, m caused by unit volume gas-fired3/m3(dry gas)；For unit volume coal Theoretical dry flue gas amount caused by gas burning, m3/m3(dry gas)；For the theoretical dry air needed for unit volume gas-fired Amount, m3/m3(dry gas)；α is excess air coefficient；
3.2.5 steam vapour amount contained in flue gas caused by the gas-fired of unit of account volume：
<mrow> <msub> <mi>V</mi> <mrow> <msub> <mi>H</mi> <mn>2</mn> </msub> <mi>O</mi> </mrow> </msub> <mo>=</mo> <mn>1.24</mn> <msub> <mi>d</mi> <mi>g</mi> </msub> <mo>+</mo> <mn>1.61</mn> <msubsup> <mi>&amp;alpha;V</mi> <mrow> <mi>g</mi> <mi>k</mi> </mrow> <mn>0</mn> </msubsup> <msub> <mi>d</mi> <mi>k</mi> </msub> <mo>+</mo> <mn>0.036</mn> </mrow>
Wherein,For steam vapour amount contained in flue gas caused by unit volume gas-fired, m3/m3(dry gas)；α is smoke evacuation Locate excess air coefficient；For the theoretical dry air amount needed for unit volume gas-fired, m3/m3(dry gas)；dkFor air Absolute humidity, kg/kg；dgFor coal gas water capacity, kg/m3(dry gas).
4. a kind of blast furnace gas boiler as-fired coal gas calorific value as claimed in claim 3 and boiler thermal output on-line monitoring method, It is characterized in that：Step 3.3 specifically includes：
Solve boiler input heat Qr：
<mrow> <msub> <mi>Q</mi> <mi>r</mi> </msub> <mo>=</mo> <msubsup> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>n</mi> <mi>e</mi> <mi>t</mi> </mrow> <mn>0</mn> </msubsup> <mo>-</mo> <mn>2257</mn> <msub> <mi>d</mi> <mi>g</mi> </msub> </mrow>
Wherein, QrHeat, kJ/m are inputted for boiler3；For the blast furnace gas butt Lower heat value of hypothesis, kJ/m3；dgFor coal gas Water capacity, kg/m3(dry gas).
5. a kind of blast furnace gas boiler as-fired coal gas calorific value as claimed in claim 4 and boiler thermal output on-line monitoring method, It is characterized in that：Step 3.4 specifically includes：
3.4.1 heat loss due to exhaust gas is calculated：
1) dry flue gas is calculated in t0To θpyAverage specific heat capacity at constant pressure c between temperatureP, gy：
cP, gy=2.458 × 10-4θpy+1.381
Wherein, cP, gyIt is dry flue gas in t0To θpyAverage specific heat capacity at constant pressure between temperature, kJ/ (m3·K)；θpyFor exhaust gas temperature, ℃；
2) vapor is calculated in t0To θpyAverage specific heat capacity at constant pressure between temperature
<mrow> <msub> <mi>c</mi> <mrow> <mi>p</mi> <mo>,</mo> <msub> <mi>H</mi> <mn>2</mn> </msub> <mi>O</mi> </mrow> </msub> <mo>=</mo> <mn>1.710</mn> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>4</mn> </mrow> </msup> <msub> <mi>&amp;theta;</mi> <mrow> <mi>p</mi> <mi>y</mi> </mrow> </msub> <mo>+</mo> <mn>1.488</mn> </mrow>
Wherein,It is vapor in t0To θpyAverage specific heat capacity at constant pressure between temperature, kJ/ (m3·K)；θpyFor exhaust gas temperature, ℃；
3) heat loss due to exhaust gas is calculated：
<mrow> <msub> <mi>q</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>V</mi> <mrow> <mi>g</mi> <mi>y</mi> </mrow> </msub> <msub> <mi>c</mi> <mrow> <mi>p</mi> <mo>,</mo> <mi>g</mi> <mi>y</mi> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>&amp;theta;</mi> <mrow> <mi>p</mi> <mi>y</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>t</mi> <mn>0</mn> </msub> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>V</mi> <mrow> <msub> <mi>H</mi> <mn>2</mn> </msub> <mi>O</mi> </mrow> </msub> <msub> <mi>c</mi> <mrow> <mi>p</mi> <mo>,</mo> <msub> <mi>H</mi> <mn>2</mn> </msub> <mi>O</mi> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>&amp;theta;</mi> <mrow> <mi>p</mi> <mi>y</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>t</mi> <mn>0</mn> </msub> <mo>)</mo> </mrow> </mrow> <msub> <mi>Q</mi> <mi>r</mi> </msub> </mfrac> <mo>&amp;times;</mo> <mn>100</mn> </mrow>
Wherein, q2For heat loss due to exhaust gas, %；θpyFor exhaust gas temperature, DEG C；t0On the basis of temperature；cP, gyIt is dry flue gas in t0To θpyTemperature Average specific heat capacity at constant pressure between degree, kJ/ (m3·K)；It is vapor in t0To θpyAverage specific heat capacity at constant pressure between temperature, kJ/(m3·K)；VgyFor actual dry flue gas amount, m caused by unit volume gas-fired3/m3(dry gas)；For unit volume Contained steam vapour amount, m in flue gas caused by gas-fired3/m3(dry gas)；QrHeat, kJ/m are inputted for boiler3；
3.4.2 heat loss due to unburned gas is calculated：
<mrow> <msub> <mi>q</mi> <mn>3</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mn>126.36</mn> <msub> <mi>V</mi> <mrow> <mi>g</mi> <mi>y</mi> </mrow> </msub> <msup> <mi>&amp;phi;</mi> <mo>&amp;prime;</mo> </msup> <mrow> <mo>(</mo> <mi>C</mi> <mi>O</mi> <mo>)</mo> </mrow> </mrow> <msub> <mi>Q</mi> <mi>r</mi> </msub> </mfrac> <mo>&amp;times;</mo> <mn>100</mn> </mrow>
Wherein, q3For heat loss due to unburned gas, %；VgyFor actual dry flue gas amount caused by unit volume gas-fired, m3/m3(dry gas)；φ ' (CO) is CO content in smoke, %；QrHeat, kJ/m are inputted for boiler3；
3.4.3 radiation loss is calculated：
<mrow> <msub> <mi>q</mi> <mn>5</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mn>5.82</mn> <mo>&amp;times;</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>D</mi> <mi>e</mi> </msub> <mo>)</mo> </mrow> <mn>0.62</mn> </msup> </mrow> <mi>D</mi> </mfrac> </mrow>
Wherein, q5For radiation loss, %；DeFor the evaporation capacity under boiler rated load, t/h；D is boiler actual evaporation, t/h.
6. a kind of blast furnace gas boiler as-fired coal gas calorific value as claimed in claim 5 and boiler thermal output on-line monitoring method, It is characterized in that：Step 3.5 specifically includes：
Boiler thermal output η is solved according to boiler various heat losses：
η=100- (q2+q3+q5)
Wherein, η is boiler thermal output, %；q2For heat loss due to exhaust gas, %；q3For heat loss due to unburned gas, %；q5It is scattered Heat loss, %.
7. a kind of blast furnace gas boiler as-fired coal gas calorific value as claimed in claim 6 and boiler thermal output on-line monitoring method, It is characterized in that：Step 3.6 specifically includes：
Hot Q is effectively utilized according to unit operation parametric solution boiler1：
1) for the unit containing reheat system：
Q1=Dgr(h″gr-hgs)+Dzr(h″zr-h′zr)+Dpw(hpw-hgs)
Wherein, Q1Heat, kJ/h are effectively utilized for boiler；DgrFor superheat steam flow, kg/h；DzrFor reheated steam flow, kg/h； DpwFor blowdown water-carrying capacity, kg/h；h″grFor superheated steam enthalpy, kJ/kg；h″zrFor reheat heat steam enthalpy, kJ/kg；h′zrFor it is cold again Vapours enthalpy, kJ/kg；hgsFor the enthalpy that feeds water, kJ/kg；hpwFor sewer enthalpy, kJ/kg；
2) for the unit without reheat system：
Q1=Dgr(h″gr-hgs)+Dpw(hpw-hgs)
Wherein, Q1Heat, kJ/h are effectively utilized for boiler；DgrFor superheat steam flow, kg/h；DpwFor blowdown water-carrying capacity, kg/h； h″grFor superheated steam enthalpy, kJ/kg；hgsFor the enthalpy that feeds water, kJ/kg；hpwFor sewer enthalpy, kJ/kg.
8. a kind of blast furnace gas boiler as-fired coal gas calorific value as claimed in claim 7 and boiler thermal output on-line monitoring method, It is characterized in that：Step 3.7 specifically includes：
Calculate blast furnace gas butt Lower heat value：
<mrow> <msub> <mi>Q</mi> <mrow> <mi>d</mi> <mo>,</mo> <mi>n</mi> <mi>e</mi> <mi>t</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <mn>1.24</mn> <msub> <mi>d</mi> <mi>g</mi> </msub> <mo>)</mo> <msub> <mi>Q</mi> <mn>1</mn> </msub> </mrow> <mrow> <msub> <mi>B</mi> <mi>g</mi> </msub> <mi>&amp;eta;</mi> </mrow> </mfrac> <mo>&amp;times;</mo> <mn>100</mn> <mo>+</mo> <mn>2257</mn> <msub> <mi>d</mi> <mi>g</mi> </msub> </mrow>
Wherein, QD, netFor blast furnace gas butt Lower heat value calculated value, kJ/m3；Q1Heat, kJ/h are effectively utilized for boiler；BgFor The blast furnace coal tolerance of line measurement, m3/h；η is boiler thermal output, %；dgFor coal gas water capacity, kg/m3。
9. a kind of blast furnace gas boiler as-fired coal gas calorific value as claimed in claim 8 and boiler thermal output on-line monitoring method, It is characterized in that：Step 3.8 specifically includes：
By blast furnace gas butt Lower heat value calculated value QD, netWith the blast furnace gas butt Lower heat value of hypothesisIt is compared, By QD, netWithDifference absolute valueCompared with the small quantity ε of setting：
IfMore than the small quantity ε of setting, then willIt is assigned to the initial blast furnace gas butt of hypothesis Lower heat valueReturn to step 3.1, step 3.1~3.8 are performed again, solve blast furnace gas butt Lower heat value meter again Calculation value QD, net, untilLess than or equal to the small quantity ε of setting；
IfLess than or equal to the small quantity ε of setting, then into step 3.9.
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